Guys...lend me your ears. Or if you don't have functional ears, lend me your hearing dogs. We bought my father an XBox 360 (slim, 4gb, wireless version) for his birthday today. Knowing beforehand that he would want to use it with his computer monitor (as he already has two monitors set up in his gaming pad) we also went ahead and bought this cable. We set up the Xbox this morning, running the video through the VGA port and the sound through the red/white + jack into the line-in.

And lo, there was video.

...And no sound.

After swearing quite a bit and using several techniques found via Google and YouTube, we've hit a total brick wall.

Firstly, we tried the trick of running the Xbox -> audio line-in cable into the back of his sound card, then plugging a (working) pair of speakers into the line-out, and making sure that Windows was running in the background with the line-in unmuted. Didn't work.

We then tried just running the line-in directly into his speaker's headphone port, and there was still no sound.

So then we brought the Xbox downstairs and plugged it into the telly via the Xbox -> red/white/yellow -> scart adaptor cable the Xbox is provided with, and everything was fine. We had audio and video, and mucked around on the Orange Box a little before sobering up.

The problem, as far as I can see, would be in one of three separate components:

1. The monitor speakers are broken. We tried running a direct line from the computer to the monitor directly, and we had no sound. But I don't know if that was because the old cable Dad found was also borked.
2. The red/white -> audio line-in adaptor the cable linked above came with is broken.
3. The entire audio side head of the cable linked above is broken, as the VGA works fine.

Please, if you have any ideas/suggestions, I'd love to hear 'em. We can't keep the Xbox plugged in down here, and Dad is desperate to get crackin' on some Portal 2.

Sounds like the audio on the monitor is broken or disabled.
I may be missing something, but if you plugged the same wires into the TV and it worked, then plugged them into the monitor and they didn't, then the point of failure should be with the monitor.

If you're running both L&R through the your line-in audio with the extra piece try unplugging either L or R. That fixed the problem for me.
It does mean it only plays through one speaker, but that worked for my dinosaur speakers anyway.

Did you click on the link? Also, I doubt anyone would purchase a specialty cable to intentionally avoid using an available HDMI input.

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As a matter of fact, I did. What good exactly does that do as this discussion goes? All it shows is the cable she purchased.

Even so, like I said, no where in her post does it say anything about NOT having the input. She sounds new to the game, hence why she is asking questions. So knowing that, maybe she doesnt know about HDMI, hmm? Possible. Yes.

Did you click on the link? Also, I doubt anyone would purchase a specialty cable to intentionally avoid using an available HDMI input.

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Yes, we purchased the speciality cable because my Dad's monitor is a first generation LCD, so it didn't have a HDMI port. I'm also not "new to the game", BlackMagnus, I'm just not very good with cables and female and male connections and stuff like that. I've been a gamer all my life. =/

Anyway, thank you those of you who suggested stuff! =3 The monitor speakers were broken. We dashed out and bought a cheap pair from Tesco's, then tried running the audio through the computer via the sound card, and it's worked! Just means Dad has to keep his PC on whilst Xboxing, but we can remedy that situation closer to Christmas (we're on a limited budget D: ).

Thanks again for all of the help and support. Fictional cookies for everyone!

Yes, we purchased the speciality cable because my Dad's monitor is a first generation LCD, so it didn't have a HDMI port. I'm also not "new to the game", BlackMagnus, I'm just not very good with cables and female and male connections and stuff like that. I've been a gamer all my life. =/

Anyway, thank you those of you who suggested stuff! =3 The monitor speakers were broken. We dashed out and bought a cheap pair from Tesco's, then tried running the audio through the computer via the sound card, and it's worked! Just means Dad has to keep his PC on whilst Xboxing, but we can remedy that situation closer to Christmas (we're on a limited budget D: ).

Thanks again for all of the help and support. Fictional cookies for everyone!

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Well thanks for clearing that up, you first post was devoid of those facts. I did say, sounds new, not is new.